(201b) Synthesis and Electrochemical Characterization of Ordered Pt Nanopattern Catalysts through Self-assembling Block Copolymer

Platinum nanoparticle (Pt NP) arrays were synthesized through self-assembled nanopatterns of block copolymers (BCs) on titanium wafers for electrocatalysis. Controllable planar distributions and morphology of Pt-NP array can improve the activity and cost of noble metal catalyst for PEM fuel cell or electrolysis. The dip-coating withdrawal rate and concentration of H₂PtCl₆ precursor had been investigated as two of most important factors on the morphology of Pt-NP arrays. The result shows that diameter of nanodotts decreased monotonously with the increase of withdrawal rate and Pt content in precursor is the third power of diameter precisely controlled within the Pt-NP size of 30 nm. Therefore the initial ECSA and durability of the Pt/Ti catalysts can be controlled through particle size and spacing, and the Pt/Ti catalysts exhibited a initial ECSA of 106.5 m².g^-1 and an nearly zero particle-aggregation during 3000-cycle CV, which may be attributed to the homogeneous Pt-NP dispersion and the ordered array to improve Pt utilization and aggregation.

Key words: BC templates, Pt catalysts, Ordered NP arrays, ECSA

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